<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->

<!DOCTYPE html>
<html style="margin: 0; padding: 0;">
<head>
<meta charset="utf-8">
<title>Simple WebGL context with Worker</title>
<script src="../../../js/webgl-test-utils.js"> </script>
</head>
<body style="margin: 0; padding: 0; overflow: hidden;">
<canvas id="c" width="1680" height="1050" style="width: 256px; height: 256px;"> <!-- scaled to fit page better -->
<script id="vshader" type="x-shader/x-vertex">
attribute vec4 vPosition;
void main()
{
    gl_Position = vPosition;
}
</script>

<script id="fshader" type="x-shader/x-fragment">
void main()
{
    gl_FragColor = vec4(1.0,0.0,0.0,1.0);
}
</script>

<script>
"use strict";
var wtu = WebGLTestUtils;
var myWorker = new Worker("context-release-worker.js");

var gl = wtu.create3DContext("c", { antialias: false });
var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);

var vertexObject = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.75,0, -0.75,-0.75,0, 0.75,-0.75,0 ]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);

gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.drawArrays(gl.TRIANGLES, 0, 3);

if (parent) {
  window.glContext = gl;
  parent.postMessage("Ready", "*");
}
</script>
</body>
</html>
